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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        #myduo {
            color:orange !important;
        }
        .mydiv {
            color:orangered;
        }
    </style>
</head>
<body>
    <div class="app">
        
        <p class="mydiv" id="myduo" style="color:orchid;">好好学习天天向上</p>
        <br/>
        好好学习天天向上
       
    </div>
</body>
</html>